Date: Sat, 6 Sep 2008 18:29:30 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: "Sean C. Farley" <scf@freebsd.org>, freebsd-emulation@freebsd.org Subject: Re: Linux applications core if running (k)qemu Message-ID: <20080906152929.GB2038@deviant.kiev.zoral.com.ua> In-Reply-To: <20080906104659.GA2113@dchagin.dialup.corbina.ru> References: <alpine.BSF.1.10.0808291711580.5866@thor.farley.org> <20080830113448.GA2152@dchagin.dialup.corbina.ru> <alpine.BSF.2.00.0809021552040.7934@thor.farley.org> <20080906104659.GA2113@dchagin.dialup.corbina.ru>
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--FG2vzoPGYsbT0vfz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Sep 06, 2008 at 02:46:59PM +0400, Chagin Dmitry wrote: > On Tue, Sep 02, 2008 at 03:56:33PM -0500, Sean C. Farley wrote: > > On Sat, 30 Aug 2008, Chagin Dmitry wrote: > >=20 > > >On Fri, Aug 29, 2008 at 05:29:09PM -0500, Sean C. Farley wrote: > > >>I am having trouble with kqemu.ko and linux.ko. If I run qemu with > > >>the following command, Linux applications (chroot, acroread, ls) will > > >>start core dumping: > > >> qemu-system-x86_64 -m 512 \ > > >> -drive file=3D/usr/QEMU/WinXP/c.img,if=3Dide,media=3Ddisk -boot c= \ > > >> -std-vga -parallel none -serial none -monitor stdio \ > > >> -net nic,model=3De1000 -net tap,ifname=3Dtap0,script=3Dno -localt= ime > > >> > > >>Loading kqemu.ko does not cause the problem, but the cores start a > > >>little after WinXP starts running. Unloading kqemu.ko does not help; > > >>the cores still happen but more randomly. I even tried unloading all > > >>linux modules and reloading them without luck. It takes a reboot. > > >> > > >>Packages: > > >>qemu-devel-0.9.1s.20080620_1 > > >>kqemu-kmod-devel-1.4.0.p1 > > >>linux_base-f8-8_4 > > >> > > >>sysctl: > > >>compat.linux.osrelease: 2.6.16 > > >> > > >>dmesg: > > >>kqemu version 0x00010400 > > >>kqemu: KQEMU installed, max_locked_mem=3D1792492kB. > > >> > > >>System is 7-STABLE as of r181963 with or without the patch to fix RT > > >>signals from Chagin. > > > > > >Interestingly... Sean, can you provide ktrace/kdump log of coring > > >apps? thnx! > >=20 > > Here they are (good and bad): > > http://www.farley.org/freebsd/tmp/linuxulator_vs_kqemu/ > >=20 > > The good trace is after the bad trace. I just kept running ktrace > > /compat/linux/bin/date over and over until I got a good trace. Before > > loading kqemu and running qemu, there were no core dumps. Also, I > > compared two bad traces and they were basically the same except for PID > > and a couple of addresses (still very close in value). > >=20 >=20 > Most likely it is a tls problem again, some days ago kib@ has made MFC > r182684, probably it will help.. I doubt it. This seems to be an ingenious kqemu bug. As far as I remember, it tries to use GDT/LDT. This probably has unwanted interaction with PCB_GS32BIT. --FG2vzoPGYsbT0vfz Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkjCodkACgkQC3+MBN1Mb4iYxACg0d0rGWlatJiR9+2E1ztZhq61 nsoAn2J3SrQL1vvW+9ChYKoaFTheHtfA =mfmx -----END PGP SIGNATURE----- --FG2vzoPGYsbT0vfz--
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